各年度结核菌素阳性率差异无显著性；
The positive rate of PPD test was no significant difference among each year.
结果35例胸内结节病，17例结核菌素试验为阳性，4例强阳性，阳性及强阳性率为60%，明显高于国内外已报道的结节病结核菌素试验阳性发生率。
Result of 35 cases of intrathoracic sarcoidosis 17 cases were tuberculin positive, 4 were strongly positive positive tuberculin reactivity (60%) was significantly higher than that published.
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